Maxtec Analyzer,O2,4" H x 3" Wx1-11/32" D R217P42

Large LCD, Calibration Reminder, Includes Adapter, Internal Sensor Application Analyze Oxygen LevelsYou may also like Quality Tuya Wifi Portable Air Quality Meter PM1.0 PM2.5 PM10 CO2 TVOC HCHO Temperature And Humidity Tester LCD Color Screen Carbon Dioxide Detector With Time And Date Display.